Como programar un blog REST

Cómo programar un blog REST Javier Vidal Postigo http://javiervidal.net/ Conferencia Rails 2007

¿Qué es Rails?

framework ruby para desarrollar aplicaciones web con acceso a base de datos

framework ruby para desarrollar aplicaciones web con acceso a base de datos convención mejor que configuración

¿Qué es MVC?

MVC en Rails DB Enrutador Vista Modelo Controlador

http://server/controller/action/id

http://server/posts/show/1

¿Qué es REST?

REST => “Representational State Transfer”

modelo de arquitectura de aplicaciones

las aplicaciones gestionan recursos

las operaciones son los verbos HTTP

recurso URI instancia de modelo

recurso URI instancia de modelo operación verbo HTTP acción del controlador

Create Read Update Delete

Create Read Update Delete insert find update delete

Create Read Update Delete insert find update delete POST GET UPDATE DELETE

Create Read Update Delete insert find update delete POST GET UPDATE DELETE create show update destroy

POST

GET

PUT

DELETE

/posts

/posts/1

/posts/1

/posts/1

# GET /posts/1

def show ... end

# POST /posts

def create ... end

# PUT /posts/1

def update ... end

# DELETE /posts/1

def destroy ... end

end

class PostsController < ApplicationController

# GET /posts/1

def show ... end

# POST /posts

def create ... end

# PUT /posts/1

def update ... end

# DELETE /posts/1

def destroy ... end

end

link_to "#{post.title}" , post_url(post)

# GET /posts/1

def show ... end

# POST /posts

def create ... end

# PUT /posts/1

def update ... end

# DELETE /posts/1

def destroy ... end

end

form_for( :post ,

:url => posts_path) do |f|

f.text_field :title

f.text_area :body

submit_tag "Create"

end

# GET /posts/1

def show ... end

# POST /posts

def create ... end

# PUT /posts/1

def update ... end

# DELETE /posts/1

def destroy ... end

end

form_for( :post ,

:url => post_path( @post ),

:html => {:method => :put }) do |f|

f.text_field :title

f.text_area :body

submit_tag "Update"

end

# GET /posts/1

def show ... end

# POST /posts

def create ... end

# PUT /posts/1

def update ... end

# DELETE /posts/1

def destroy ... end

end

link_to 'Borrar' , post_path(post),

:method => :delete

Todavía hay más

class PostsController < ApplicationController # GET /posts def index ... end # GET /posts/1 def show ... end # GET /posts/new def new ... end # GET /posts/1/edit def edit ... end # POST /posts def create ... end # PUT /posts/1 def update ... end # DELETE /posts/1 def destroy ... end end

GET

GET

GET

GET

POST

PUT

DELETE

/posts

/posts/1

/posts/new

/posts/1/edit

/posts

/posts/1

/posts/1

index

show

new

edit

create

update

destroy

posts_path

post_path(1)

new_post_path

edit_post_path(1)

posts_path

post_path(1)

post_path(1)

def add_comment ... end

end

end

class CommentsController < ApplicationController

def assign_to_post ... end

end

end

end

recursos anidados

end

end

recursos anidados

añadiendo un nuevo recurso “membership”

class Post < ActiveRecord::Base

has_many :memberships

has_many :comments , :through => :memberships

end

class Comment < ActiveRecord::Base

has_many :memberships

end

class Membership < ActiveRecord::Base

belongs_to :comment

belongs_to :post

end

post membership comment

RailsConf '06: World of Resources David Heinemeier Hansson http://media.rubyonrails.org/presentations/worldofresources.pdf Desarrollo REST con Rails Ralf Wirdemann y Thomas Baustert (traducción de Juán Lupión) http://www.b-simple.de/download/restful_rails_es.pdf RESTful Web Services Leonard Richardson y Sam Ruby http://www.amazon.com/ Referencias

http://javiervidal.net/ [email_address]